A tech support center receives inquiries through three channels: Phone, Email, and Live Chat. 45% of inquiries come through Phone, 40% through Email, and 15% through Live Chat.
The probability that an inquiry remains unresolved after the first contact is:
Draw a tree diagram to illustrate this situation.
An inquiry is selected at random. Find the probability it is unresolved.
Given that an inquiry is unresolved, find the probability it was made via the Phone channel.
Practise Edexcel A Level Maths Tree Diagrams with exam-style questions for A Level Maths. 27 questions, matched to the Edexcel A Level Maths (9MA0) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
